Which particle diagram represents a sample of matter that can not be broken down by chemical means?

Answers

Answer 1

Answer:

Answer;

Considering the attached image;

The correct answer is D.

Explanation;

-An element is a substance that can not be broken down into simpler substances by ordinary chemical means. Example, iron, gold, hydrogen , carbon, oxygen , etc.

-Elements are made of atoms. An atom is the smallest particle of an element that can take part in a chemical reaction. Atoms of different elements are different. Atoms of one element are basically alike.

Answer 2

Answer: In the picture below that I attached, the answer is D.

In the diagram, there are only one type of element depicted.

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Identify the number of neutrons in one atom of sulfur with an isotopic mass number of 34 Amu

Answers

Mass number = number of neutrons + number of protons

In a periodic table, or other tables, you find that the atomic number of sulfur is 16. That means it has 16 protons.

Then the number of neutrons = 34 - 16 = 18.

When the pressure that a gas exertson a sealed container changes
from atm to 1.80 atm, the
temperature changes from 86.0°C to
30.0°C.

Answers

Answer:

The pressure changes from 2.13 atm to 1.80 atm.

Explanation:

Given data:

Initial pressure = ?

Final pressure = 1.80 atm

Initial temperature = 86.0°C (86.0 + 273 = 359 K)

Final temperature = 30.0°C (30+273 =303 K)

Solution:

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

P₁ = P₂T₁ /T₂

P₁ = 1.80 atm × 359 K / 303 K

P₁ = 646.2 atm. K /303 K

P₁ = 2.13 atm

The pressure changes from 2.13 atm to 1.80 atm.

Answer:

2.13

Explanation:

Unicellular organisms are made up of many different cells.

True

False

Answers

False - the answer is in the name. “Unicellular” means one cell.

Which is evidence that scientists use to support the big bang theory? A.
There is constant cosmic background radiation.

B.
Galaxies are moving toward each other.

C.
A loud explosion can be heard in the radio frequencies everywhere in the universe.

D.
Hydrogen and helium are the most abundant elements in the universe.

Answers

The right answer for the question that is being asked and shown above is that: "C. A loud explosion can be heard in the radio frequencies everywhere in the universe." The evidence that scientists use to support the big bang theory is that A loud explosion can be heard in the radio frequencies everywhere in the universe.

l. Given the balanced equation representing a reaction:What occurs during this reaction?1) Energy is absorbed as bonds are broken.2) Energy is absorbed as bonds are formed.3) Energy is released as bonds are broken4) Energy is released as bonds are formed.

Answers

1) energy is absorbed and bonds are broken

This is due to two reasons
1. The breaking of bonds requires and input energy. The formation of bonds is a release on energy. As bond breaking requires energy, it is only natural that once of the answers would involve the absorption of energy.
2. O2 is the covalent bond between two oxygen molecules. When these molecules are separated the bond is broken. As such the answer must be 1

I hope this helps

Draw a model that compares the arrangement of the subatomic particles of oxygen-16 to another isotope, oxygen-18.

Answers

Explanation:

Answer and Explanation:

Oxygen-16 and oxygen-18 differ in structure only in that oxygen-18 has two more neutrons in its nucleus than oxygen-16 has.

There are three known stable isotopes of oxygen (8O): 16O, 17O, and 18O. Radioactive isotopes ranging from 11O to 26O have also been characterized, all short-lived.

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